Flexible tubing



A. SUNDH.

FLEXIBLE TUBING.

' APPLICATION man APR.25. 1919.

Patented J an. 6, 1920.

INVENTOR A ORNEY AUGUST SUNDH, OF HASTINGSUION-HU DSON, NEW YORK.

FLEXIBLE TUBING.

Specification of Letters Patent.

Patented J an. 6, 1920.

Application filed April 25, 1919, Serial No. 292,566.

To all whom it may concern:

Be it known that I, AUGUST SUNDH, a citizen of the United States, and a resident of Hastings-upon-Hudson, county of West chester, and State of New York, have invented certain new and useful Improvements in Flexible Tubing, of which the following is a specification.

My invention relates to an improvement in flexible metallic tubing and it is an object thereof to provide a tubing which will not be cumbersome, one which will be easy to manufacture, one which will not easily become leaky, and one which if it does become leaky may easily be repaired.

Briefly the tubing of the present invention is made up of a metallic strip wound helically to form inward and outward turned loops, with adjacent edges of the strip over lapping at the inward turned loops, the loop at this point being reinforced by solder,

and if desired by a wire helix embedded in the solder.

I have found in a tubing of the type above outlined, that not only are the overlapping edges of the metallic strip forming the tubing bound together by the solder, but the tubing in effect is reinforced at this point, with the result that flexing of the tubing to a large extent takes place in the outward turned loops, and for such reason fracture and leakage of the tubing would occur in the latter but as these loops are accessible repairs may easily be made.

Reinforcing the inward turned loops as I have-done also makes the tubing that much more capable of withstanding internal pressures and flexing of the tubing is so controlled that the same is not easily distorted permanently.

I have found also that the solder, being of a softer nature than the metal of the metallic strip, makes a very excellent reinforcement, binds the overlapping edges of the strip firmly, trols the flexing of the tubing as noted above.

When the wire helix hereinbefore mentioned-is used the solder flows around the spiral, filling up the space at the side of the same and a short distance up the outside of the sides of the loops, to hold the wire rig idly'secured to the tubing, and at the same time by gradually reinforcing the tubing from the points where it is rigid, sharp edges, which may be injured by flexing of and if applied correctly conthe tubing and in time cause it to leak, are eliminated.

In the accompanying drawings wherein an embodiment of my invention is illustrated,

Figures 1 and 2 show in elevation, and sectional elevation respectively a tubing made in accordance with my invention, and

Fig. 3 shows in section an enlarged portion of the wall of the tubing.

1 designates a metal strip wound helically to form inwardly "and outwardly extending loops, 2 and 3, respectively, the adjacent edges of the metal strip overlapping each other at 4 to form the inwardly extending loops, these overlapping edges being bound or held together by solder 5 which as hereinbefore pointed out acts as reinforcing means for the tubing, and at the same time so controls the flexing of the tubing that the major portion of the flexing takes place in the outward turned loops, 3; and 'any' leakage space around the helix and flowing up the outer side of the loops as designated at 7 and 8, thereby by a gradual reinforcement eliminating any sharp edges which otherwise would exist and which in time would cause leakage of the tubing.

a It is to be understood that the tubing may be made in any length desired, and that the solder may be applied either with a soldering iron, or the tubing may be dipped as in galvanizing processes, the excess solder being blown off with superheated steam or hot air, or the solder may be applied in any other manner desired.

It will be seen, however, that I have pro vided a flexible metallic tubing possessing the advantages above set out, and furthermore that by soldering the overlapping edges of the metal strip dirt and grit is kept out and wedging apart of the edges from this source when the tubing is bent is elimirelatively rigid member to which the strip is rigidly attached by means of a metallic binder, for the purpose set forth.

2. A flexible tubing comprising a helically wound metal strip and a helically wound relatively rigid member, and fusible metallic binding material for rigidly securing said member to the strip and for rigidly securing the surfaces of the strip, for the purpose set forth.

3. A flexible tubing comprising a helically wound corrugated metal strip and an external helical member to which'the adjacent edges of the corrugated strip are rigidly secured by means of a metallic binder inclosing the external helical member and rigidly securing the circumferential surfaces of the same with the edges of the metal strip, for the purpose set forth.

4'. A flexible tubing comprising a helically woundcorrugated metal strip and a helically wound relatively rigid member, the

edges of the metal strip overlapping at a pointwhere the helically wound relatively rigid member rests, and a column of solder for securing the surfaces of the strip and the relatively rigid member together to cause the same to cooperate, for the purpose set forth.

5. The method of making flexible metallic tubing consisting in helically winding a strip having a plurality of complete corrugations and rigidly securing the same to a helically wound relatively rigid member by means of a column of fusible metallic binder. for the purpose set forth.

6. The method of making flexiblemetallic tubing consisting in helically winding a metallic strip having a plurality of complete corrugations to cause adjacent edges of the strip to overlap at the inwardly turned loops of the corrugations, and rigidly securing the overlapping edges of the strip to each other and to a helically wound relatively rigid member.

7. A flexible tubing comprising a helically wound corrugated metal strip with the edges overlapping and fused together by a metallic binder and'a second comparatively rigid member embedded in said fusible metallic binder for the purpose set forth.

8. A flexible tubing comprising a helically wound corrugated metal strip forming an inner and an outward loop with the edges of the metal strip overlapping at .the inner loop and a column of fusible material in the bottom of said loop for the purpose set forth.

9. A flexible metallic tubing comprising a helically wound metal strip, forming two being reinforced in thickness to a degree of inflexibility over the desired surface for the purpose set forth.

12. In a flexible tubing comprising a helicallywound metal strip, forming an inner and an outward loop, the edges of the strip overlapping in the inner loop, reinforcement inserted in said loop for binding the edges of the strip and for obtaining inflexibility of the loop at desired parts of the surface, for the purpose set forth.

13. In a flexible tubing comprising a 'helically wound metal strip, forming an inner and an outward loop, the edges of the strip being overlapping in the inner loop and reinforcement inserted in said 100p r binding the edges of the strip and for obtaining inflexibility of the loop at the desired parts of the surface and also for obtaining resistance of flexibility to a desired degree on other parts of the surfaces of the loop, for the purpose set forth.

This specification signed this 23 day of April, A. D. 1919.

, AUGUST SUNDH; 

